Changed broken conf in install/conf.d/datasources.ini + message enhancement for invalid configuration key

install/conf.d/datasources.ini

@@ -1,5 +1,5 @@
 [lodel2.datasources.default]
 identifier = dummy.example
 
-[lodel2.datasource.dummy.example]
+[lodel2.datasource.dummy_datasource.example]
 dummy =

lodel/settings/settings_loader.py

@@ -176,7 +176,7 @@ class SettingsLoader(object):
         remains = self.getremains()
         err_l = self.__errors_list
         for key_id, filename in remains.items():
-            err_l.append(SettingsError( msg = "Invalid configuration",
+            err_l.append(SettingsError( msg = "Invalid configuration key",
                                         key_id = key_id,
                                         filename = filename))
         if len(err_l) > 0: